In 2104, 11 years after the Prometheus expedition, the colonization-ship Covenant is bound for a remote planet, Origae-6, when they discover an uncharted paradise with a threat beyond their imagination. From the 2017 Ridley Scott film Alien: Covenant, this is the exact used human embryo among the cargo of the ship. Steatite Ampules, also known as Urns or Vases, were cylindrical enclosures designed by the Engineers to establish and maintain the controlled environment necessary to store Chemical A0-3959X.91-15. Within the Ampules, the A0-3959X.91-15 was contained by four conical-shaped glass vials, or phials. This was to ensure the agent's ability to retain infectivity and virulence after a prolonged period of storage. Chemical A0-3959X.91 - 15, also known as Agent A0-3959X.91 - 15 and referred to colloquially as the "black goo" or "black liquid", is an extremely potent and virulent mutagenic pathogen, composed of millions of small micro-organisms, that was manufactured by the Engineers as a biological weapon, presumably for military purposes. Due to its volatile nature at ambient temperature, the Engineers housed the pathogen within Steatite Ampules. This is the exact hero vial seen being picked up and held by David when he takes Walter on a tour in his lair. The liquid is still present inside and can be seen easily when the vial is tilted.